dothead
scholastic sledgehammer
Reged: 08/13/08
Loc: Heidelberg, Germany
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: RodgerHouTex]
#4399413 - 02/20/11 02:03 PM
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yes, Rodger, please give us a report when you've used the eyepiece.
Did you order a single one, or a pair ?
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RodgerHouTex
scholastic sledgehammer
Reged: 06/02/09
Loc: Houston, Texas, USA
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: dothead]
#4399775 - 02/20/11 04:59 PM
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Just a single one. I don't have binoviewers. I will definately give a report. Just as an aside, I do have and extensively use the Zeiss fixed focal length Diascope eyepiece. It's 12.8mm fl. with a 65 deg. fov. It is the sharpest most contrasty eyepiece I have. The color fidelity is perfect and it has almost undetectable scatter. I love it.
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: dothead]
#5261908 - 06/08/12 01:14 PM
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How good is the E-Pl 10x/20 Zeiss Microscope eyepiece (44 42 31)?
There are some on Ebay.
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russell23
Post Laureate
Reged: 05/31/09
Loc: Upstate NY
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: saemark30]
#5261984 - 06/08/12 01:53 PM
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How good is the E-Pl 10x/20 Zeiss Microscope eyepiece (44 42 31)?
There are some on Ebay.
I've wondered the same thing, but it also concerns me that for some reason these listings always indicate that the eyepiece either does or does not have "delamination". I'm not sure why that is such an issue for microscope eyepieces. I've never seen it mentioned for telescope eyepieces. One listing mentioned that delamination will reduce contrast.
Dave
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: russell23]
#5262038 - 06/08/12 02:19 PM
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Well there are only 3 elements, so if there is delamination it can be repaired for minor cost.
But I have read there are several versions:
44 42 31,
44 42 32,
44 42 36
not sure if that is significant.
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daniel_h
Carpal Tunnel
Reged: 03/08/08
Loc: VIC, Australia
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: saemark30]
#5262355 - 06/08/12 07:01 PM
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I have one of the zeiss 3-el asph, one of the originals, it gives terrific neutral colour, er is great & the fov close to that of a plossl is fine for my eyes
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Svezda
scholastic sledgehammer
Reged: 06/01/07
Loc: Texas
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: saemark30]
#5262742 - 06/09/12 12:56 AM
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Well there are only 3 elements, so if there is delamination it can be repaired for minor cost.
But I have read there are several versions:
44 42 31,
44 42 32,
44 42 36
not sure if that is significant.
Delamination would be in the cemented achromat (2 elements of the three). I am almost sure you could /not/ get a replacement achromat from Zeiss for this, and I would bet it would be difficult to install if you could find one. The cost of the eyepiece new isn't very high directly from Zeiss, so even if you could get them to sell you a replacement achromat, I don't think it would be a small cost relative to the cost of a new eyepiece (just my speculation).
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Svezda
scholastic sledgehammer
Reged: 06/01/07
Loc: Texas
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: russell23]
#5262750 - 06/09/12 01:06 AM
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Quote:
Quote:
How good is the E-Pl 10x/20 Zeiss Microscope eyepiece (44 42 31)?
There are some on Ebay.
I've wondered the same thing, but it also concerns me that for some reason these listings always indicate that the eyepiece either does or does not have "delamination". I'm not sure why that is such an issue for microscope eyepieces. I've never seen it mentioned for telescope eyepieces. One listing mentioned that delamination will reduce contrast.
Dave
Having been a microscopist for a number of years and generally familiar with microscopes even though I don't do much with them now, I think that delamination is mentioned in microscope eyepiece ads (I've always noticed that also) because not only is the light that goes through microscope eyepieces much more intense than the light from M42, for example, but that intense light is /left on all the time/ (due to microscope lamp life being shortened a lot by turning it off and on again frequently, and because lamp bulbs aren't cheap, and changing and adjusting them isn't a lot of fun).
I think that it's possible that these bulbs emit a significant amount of UV light. Even if that's not the case, I'm sure that the many thousands of hours of intense light passing through the eyepieces tends to degrade the optical cement used for cementing achromats and this is what is being referred to as 'delamination' - you'd probably see shiny areas where there is now an air interface where there should be transparent Canada Balsam or some modern equivalent.
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Svezda
scholastic sledgehammer
Reged: 06/01/07
Loc: Texas
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: RodgerHouTex]
#5262803 - 06/09/12 02:15 AM
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Okay. I would like to order the Zeiss and believe the one I want is the 444232 which is the E-PL 10X/20 Br. Foc. eyepiece. Is that correct for $223 on Zeiss online? By the way what does E-PL and Br. Foc. mean.
Also I spent all afternoon trying to find some description of the various microscope eyepieces that Zeiss has and had no luck. If you click on the Eyepiece ... in blue, all you get is a picture. If anyone knows where the descriptions might be and what the nomenclature means it would be very helpful. I can't believe someone would drop $1500 dollars for one of these eyepieces and not know what they are buying.
Thanks.
I agree - it's crazy. The only thing I can think is that almost all people buying these are serviced by a Zeiss rep (like the ones who come out to my company from Olympus, Nikon, Zeiss, etc to service and try to sell new eqpt). This rep probably recommends what a client should buy, and client, knowing little about microscope eyepieces, would probably follow the advice of said rep. The client might simply order the recommended eyepieces online but wouldn't need to know the specifics about eyepieces such as we amateur astronomers want to know. This might explain the complete lack of relevant details...
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Keith Howlett
Pooh-Bah
Reged: 03/06/07
Loc: Northumberland, UK
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: Heavens Above]
#5262848 - 06/09/12 03:38 AM Attachment (12 downloads)
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Thanks guys. Anyone with experience of the Zeiss?
Hi Tim,
I used the 25mm Aspheric Orthos that used to ship with the TMB Supermonos for several years, IIRC they are the same but in the metal barrel.
Personally I found them very good, I could see significantly more detail with the TMB than a with a 25mm Televue Plossl for solar H-Alpha. (I like the 25mm TV Plossl too.)
The outer 25% of the field was soft but the inner part was comparable to the 25mm ZAO I's that I subsequently bought.
At the time the price of the TMB 25mm Aspheric Orthos very reasonable and I would be perfectly happy if I had kept them as my only 25mm eyepieces.
Cheers,
Keith
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RodgerHouTex
scholastic sledgehammer
Reged: 06/02/09
Loc: Houston, Texas, USA
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: Keith Howlett]
#5263133 - 06/09/12 10:16 AM
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I purchased the 44 42 32 about a year or more ago and it is unusable as a telescope eyepiece. The field is very bright (no coatings?) there is field curvature, etc., and it's made in China, yet cost me, with the adapter $400.
The Zeiss Diascope fixed focal length (12.8mm) spotting scope eyepiece is light years ahead. Very contrasty, dark, flat field, high color fidelity, etc. It is my most used eyepiece. It also requires an adapter that is readily available. Total cost of around $500.
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johnnyha
Postmaster
Reged: 11/12/06
Loc: Sherman Oaks, CA
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: RodgerHouTex]
#5263616 - 06/09/12 04:07 PM
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I use the Brandon 24mm Anniversary (flat top) in my binoviewers and they are just gorgeous to look at and view through. They are 53 degrees so have a fairly large FOV even for a Brandon. They also barlow extremely well so make excellent planetary eyepieces and are extremely lightweight so make wonderful bino pairs.
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Ava
super member
Reged: 11/30/11
Loc: Sweden
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: RodgerHouTex]
#5263625 - 06/09/12 04:12 PM
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I've got some Zeiss Pl 10x/25 Br. Foc. with serial number 444034 on the way, anyone know the details about these? Are they also aspheric orthos? They seem to have 4 elements in 3 groups. Markus Ludes at APM sells some new that have serial number 444034-9000-000 anyone know the difference, or significance of those last extra numbers?
Thanks,
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: Ava]
#5266772 - 06/11/12 05:15 PM
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Is it an easy matter to remove the lenses from the E-PL eyepiece?
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: RodgerHouTex]
#5268221 - 06/12/12 02:51 PM
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Too bad the 44 42 32 are made in China.
It's obviously a 2-1 design.
Does anyone know which lens is the cemented doublet?
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johnnyha
Postmaster
Reged: 11/12/06
Loc: Sherman Oaks, CA
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: saemark30]
#5268260 - 06/12/12 03:13 PM
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44 42 32 is a four element 3 group design according to the APM website. Not sure about it being aspheric?
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: johnnyha]
#5268273 - 06/12/12 03:20 PM
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Well we don't want the 44 42 32 for one thing.
Why don't you ask Markus about his E-PL? Could be as misprint.
It it stated by Thomas Back to be a aspherical 2-1 design and has a history since 2003 of being a telescope eyepiece.
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saemark30
scholastic sledgehammer
Reged: 02/21/12
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Re: Zeiss 25mm Aspheric Ortho or Brandon 24mm?
[Re: saemark30]
#5268280 - 06/12/12 03:23 PM
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There seems to be many models of E-PL.
One is the 44 42 34 with 6 elements if the APM site is correct.
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